通過IUImagePickerController方法獲取系統的相簿,而想要得到從系統相簿得到的圖片的資訊需要以下幾步:

1：獲得從UIImagePicker選擇的照片的Assert；

2：得到Assert的ALAssertRepresentation；

3：ALAssertRepresentation有個filename的屬性

程式碼具體如下:

該方法是UIImagePickerController中的代理中的方法

<span style="font-size:18px;"> - (void)imagePickerController:(UIImagePickerController *)picker 
                              didFinishPickingMediaWithInfo:(NSDictionary *)info {  
      
        NSURL *imageURL = [info valueForKey:UIImagePickerControllerReferenceURL];  
        ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset)  
        {  
            ALAssetRepresentation *representation = [myasset defaultRepresentation];  
            NSString *fileName = [representation filename];  
            NSLog(@"fileName : %@",fileName);  
        };  
      
     ALAssetsLibrary* assetslibrary = [[[ALAssetsLibrary alloc] init] autorelease];  
        [assetslibrary assetForURL:imageURL   
                       resultBlock:resultblock  
                      failureBlock:nil];  
      
    } </span> 
 

<span style="font-size:18px;">#import <AssetsLibrary/ALAsset.h>

#import <AssetsLibrary/ALAssetsLibrary.h>

#import <AssetsLibrary/ALAssetsGroup.h>

#import <AssetsLibrary/ALAssetRepresentation.h></span>

2.獲取系統相簿中的圖片,將圖片儲存到本地

注:轉化為NSData型別來儲存圖片,程式碼如下:

 //儲存圖片 方法1 
 //NSArray*paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                                                         NSUserDomainMask, YES);  
 //NSString*documentsDirectory=[paths objectAtIndex:0];    
 //NSString*aPath=[documentsDirectory 
       stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.jpg",@"test"]];
 //方法2
 //NSHomeDirectory(),方法是獲取沙盒根路徑,test是自定義圖片名,可用上述方法中獲取的名字替換
 NSString *aPath=[NSString stringWithFormat:
                                  @"%@/Documents/%@.jpg",NSHomeDirectory(),@"test"]; 
 //image是對應的圖片,即圖片通過UIPickerController獲取系統相簿圖 
 NSData *imgData = UIImageJPEGRepresentation(image,0);   
  //儲存到當地檔案中   
 [imgData writeToFile:aPath atomically:YES];     
 

整理以上程式碼如下:

- (void)imagePickerController:(UIImagePickerController *)picker 
                            didFinishPickingMediaWithInfo:(NSDictionary *)info {
    //獲取正在編輯的圖片
    UIImage *image = [info valueForKey:UIImagePickerControllerEditedImage];
    self.imageUrl = [info valueForKey:UIImagePickerControllerReferenceURL];
    
    
    //獲取圖片的名字資訊
    ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset)
    {
        ALAssetRepresentation *representation = [myasset defaultRepresentation];
        self.imageName = [representation filename];//self.imageName是屬性
    };
    
    ALAssetsLibrary* assetslibrary = [[[ALAssetsLibrary alloc] init] autorelease];
    [assetslibrary assetForURL:self.imageUrl
                   resultBlock:resultblock
                  failureBlock:nil];
    //將圖片新增到新的檢視上
    self.imageView.image = image;
    
    [self dismissViewControllerAnimated:YES completion:^{
    

    //獲取圖片的型別前的名字,將字串切割操作   
   NSString *imagePath = [[self.imageName componentsSeparatedByString:@"."] 
                                               firstObject];
   NSString *aPath=[NSString stringWithFormat:@"%@/Documents/%@.jpg",
                                                    NSHomeDirectory(),imagePath];

        
  NSData *imgData = UIImageJPEGRepresentation(image,0);
  [imgData writeToFile:aPath atomically:YES];
    
    }];
}

原文地址:點選